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SCO X-1 data from 6 cm VLA observations during 1981-1990 were analyzed for periodic or quasi-periodic variations. The data analysis included both standard FFT based periodogram and mean-square fitting. A periodogram algorithm developed by Lomb (1976) and Scargle (1982) provided statistical indicators of the periodic probabilities. The Lomb-Scargle periodogram tests the significance of the sampled data assuming Gaussian noise processes. Through the analysis, we have discovered a periodic signal which we will discuss.
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